Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbb323cc3d52668…

MALICIOUS

PDF

82.7 KB Created: 2021-03-17 19:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab348a034ffe8f1b18b3f28aa3cd20e0 SHA-1: 21c317591b2c7d554fa8057d05e8cad54583e51f SHA-256: 1fbb323cc3d5266891a6c7374ef7e735d6903856fa7d062c7f738855e8837bde
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=antenatal+screening+nice+guidelines
    • http://aires.fun/workplace_health_safety_and_welfare_regulations_1992178ze.pdf
    • https://cdn.sqhk.co/kulobibab/jgTMq8m/tomando_mate_in_english.pdf
    • https://cdn.sqhk.co/wuvexudid/JtPijjd/dual_monitor_desktop_wallpaper_windows_10.pdf
    • https://cdn.sqhk.co/feluxolid/o25YUii/90751837153.pdf
    • https://cdn.sqhk.co/rasirise/ejb8jaD/54243947843.pdf
    • http://muzibatixabu.mypressonline.com/agamemnon_summary.pdf
    • https://cdn.sqhk.co/mojupesonon/mjiiH1E/70204985723.pdf
    • http://begdas.fun/97034649538fhlap.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/how_to_analyse_data_in_sql_server.pdf
    • https://cdn.sqhk.co/jabosuve/x8IjhFr/saxokelusimipafixuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5c61abf7-cb6a-4092-8161-4b3290dc2008/the_theory_of_moral_sentiments_summary.pdf
    • http://fubavinexazixo.onlinewebshop.net/95643120200.pdf
    • http://pawuzax.onlinewebshop.net/tixowab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f292.bin
24080c95fa5aa2556f626173edf59f5f3b9fe9be5b83ee98849d3201e5ea2e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 5096 bytes
font_01_sfnt_off000103f1.bin
256ae88d249265be344488fa01d4b66762988562121bdb794c56a09993fc4c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 10728 bytes
font_02_sfnt_off00012893.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16060 bytes

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